Throwout bearing or heat shield?

I have a 2006 Ford F250 super duty kingcab 6.0 with 6 speed manual transmission. It just started making a clattering sound when i let off the gas in 1, 2, 3 gear but not in 4, OD or in Neutral with or without clutch engaged. Could this be throw out bearing or heat shield?

Well, as the heat shield on the catalytic converter is considerably easier to get at then the clutch, climb under the truck, give it a thump & see.

Thanks just looked and forgot i don't have catalytic converter so got to be throw out bearing

The throwout bearing will make noise only when the clutch pedal is depressed. Letting of the gas and hearing it would indicate a multitude of possibilities. A common cause is slack or play in the driveline due to faulty U joints. Check for play up and down and side to side in your driveline at both U joints.

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